56F827 datasheet(46/60 Pages) FREESCALE

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56F827 Technical Data, Rev. 12

Freescale Semiconductor

Delay from STCK high to STFS (bl) high - Slave5

tTFSBHS

0.1

—

Delay from STCK high to STFS (wl) high - Slave5

tTFSWHS

0.1

—

Delay from SRCK high to SRFS (bl) high - Slave5

tRFSBHS

0.1

—

Delay from SRCK high to SRFS (wl) high - Slave5

tRFSWHS

0.1

—

Delay from STCK high to STFS (bl) low - Slave5

tTFSBLS

-1

—

Delay from STCK high to STFS (wl) low - Slave5

tTFSWLS

-1

—

Delay from SRCK high to SRFS (bl) low - Slave5

tRFSBLS

-46

—

Delay from SRCK high to SRFS (wl) low - Slave5

tRFSWLS

-46

—

STCK high to STXD enable from high impedance - Slave

tTXES

——

—

STCK high to STXD valid - Slave

tTXVS

1—

STFS high to STXD enable from high impedance (first bit) - Slave

tFTXES

5.5

—

STFS high to STXD valid (first bit) - Slave

tFTXVS

6—

STCK high to STXD not valid - Slave

tTXNVS

—

STCK high to STXD high impedance - Slave

tTXHIS

—

28.5

SRXD Setup time before SRCK low - Slave

tSS

4—

—

SRXD Hold time after SRCK low - Slave

tHS

4—

—

Synchronous Operation (in addition to standard external clock parameters)

SRXD Setup time before STCK low - Slave

tTSS

4—

—

SRXD Hold time after STCK low - Slave

tTHS

4—

—

1. Slave mode is externally generated clocks and frame syncs

2. Max clock frequency is IP_clk/4 = 40MHz / 4 = 10MHz for an 80MHz part.

3. All the timings for the SSI are given for a non-inverted serial clock polarity (TSCKP=0 in SCR2 and RSCKP=0 in SCSR)

and a non-inverted frame sync (TFSI=0 in SCR2 and RFSI=0 in SCSR). If the polarity of the clock and/or the frame sync have

been inverted, all the timings remain valid by inverting the clock signal STCK/SRCK and/or the frame sync STFS/SRFS in the

tables and in the figures.

4. 50% duty cycle

5. bl = bit length; wl = word length

Table 3-15 SSI Slave Mode1 Switching Characteristics

Operating Conditions: VSSIO=VSS = VSSA = 0V, VDDA =VDDIO=3.0–3.6V, VDD = 2.25–2.75V, TA = –40° to +85°C, CL ≤ 50pF, fop = 80MHz

Parameter

Symbol

Min

Typ

Max

Units

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